diff --git a/gateway/platforms/base.py b/gateway/platforms/base.py
index 98588648db0..516545469f0 100644
--- a/gateway/platforms/base.py
+++ b/gateway/platforms/base.py
@@ -5859,17 +5859,15 @@ class BasePlatformAdapter(ABC):
                 media_files, response = self.extract_media(response)
                 media_files = self.filter_media_delivery_paths(media_files)
 
-                # Deduplicate against media already delivered in prior turns.
-                # The model may echo a previous MEDIA: tag or bare file path in
-                # a later response; without this guard the same file is sent
-                # repeatedly.
+                # Do NOT deduplicate MEDIA tags against prior turns here.
+                # The auto-append path in GatewayRunner._run_agent_inner already
+                # deduplicates auto-appended tags via _collect_auto_append_media_tags
+                # with history_media_paths, so this filter would only catch explicit
+                # MEDIA tags the model deliberately included in its response — which
+                # must be preserved (user asked to resend an image, the model echoed
+                # a path intentionally, etc.).  Bare-file-path dedup still applies
+                # to local_files below via the same _history_media_paths set.
                 _history_media_paths = self._history_media_paths_for_session(session_key)
-                if _history_media_paths:
-                    media_files = [
-                        (path, is_voice)
-                        for path, is_voice in media_files
-                        if path not in _history_media_paths
-                    ]
 
                 # Extract image URLs and send them as native platform attachments
                 images, text_content = self.extract_images(response)